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. 2021 Jan 25;13:62. doi: 10.1007/s40820-020-00578-z

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 10 — a Crystal structure of MA₂CuCl₂Br₂, showing the alternation of organic and inorganic layers and the Cu-X bond lengths in the inorganic framework. b Electronic band structure of MA₂CuClBr₃ investigated by DFT simulation. c J–V curve of solar cells sensitized with MA₂CuCl₂Br₂ (red) and MA₂CuCl_0.5Br_3.5 (brown) under 1 sun of light illumination. The red and brown dashed lines represent dark current. Reproduced with permission from Ref. [63]